Every morning, mike the security guard at cp high school opens all 1000 doors in the building. let's assume the doors are numbered 1-1000. the next security guard closes all even numbered doors. the third security guard touches all doors that are multiples of 3. if a door is open, he'll close it and vice versa. the fourth guard changes the position of every fourth door (if it's open he'll close it and the fifth guard changes the position of every fifth door and so on, until the 1000th guard changes only door 1000. how many doors are left open in the end?

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.

answer: h

step-by-step explanation: